当前位置：Gxlcms > asp.net > asp.net 添加水印的代码(已测试)

asp.net 添加水印的代码(已测试)

时间：2021-07-01 10:21:17 帮助过：8人阅读

加水印的功能代码如下所示
代码如下:


/// <summary> 
/// 图片修改类,主要是用来保护图片版权的，版权归原作者所有 
/// </summary> 
public class picmark 
{ 
#region "member fields" 
private string modifyImagePath = null; 
private string drawedImagePath = null; 
private int rightSpace; 
private int bottoamSpace; 
private int lucencyPercent = 70; 
private string outPath = null; 
#endregion 
public picmark() 
{ 
} 
#region "propertys" 
/// <summary> 
/// 获取或设置要修改的图像路径 
/// </summary> 
public string ModifyImagePath 
{ 
get { return this.modifyImagePath; } 
set { this.modifyImagePath = value; } 
} 
/// <summary> 
/// 获取或设置在画的图片路径(水印图片) 
/// </summary> 
public string DrawedImagePath 
{ 
get { return this.drawedImagePath; } 
set { this.drawedImagePath = value; } 
} 
/// <summary> 
/// 获取或设置水印在修改图片中的右边距 
/// </summary> 
public int RightSpace 
{ 
get { return this.rightSpace; } 
set { this.rightSpace = value; } 
} 
//获取或设置水印在修改图片中距底部的高度 
public int BottoamSpace 
{ 
get { return this.bottoamSpace; } 
set { this.bottoamSpace = value; } 
} 
/// <summary> 
/// 获取或设置要绘制水印的透明度,注意是原来图片透明度的百分比 
/// </summary> 
public int LucencyPercent 
{ 
get { return this.lucencyPercent; } 
set 
{ 
if (value >= 0 && value <= 100) 
this.lucencyPercent = value; 
} 
} 
/// <summary> 
/// 获取或设置要

输出图像的路径
/// </summary>
public string OutPath
{
get { return this.outPath; }
set { this.outPath = value; }
}
#endregion
#region "methods"
/// <summary>
/// 开始绘制水印
/// </summary>
public void DrawImage()
{
Image modifyImage = null;
Image drawedImage = null;
Graphics g = null;
try
{
//建立图形对象
modifyImage = Image.FromFile(this.ModifyImagePath);
drawedImage = Image.FromFile(this.DrawedImagePath);
g = Graphics.FromImage(modifyImage);
//获取要绘制图形坐标
int x = modifyImage.Width - this.rightSpace;
int y = modifyImage.Height - this.BottoamSpace;
//设置颜色矩阵
float[][] matrixItems ={
new float[] {1, 0, 0, 0, 0},
new float[] {0, 1, 0, 0, 0},
new float[] {0, 0, 1, 0, 0},
new float[] {0, 0, 0, (float)this.LucencyPercent/100f, 0},
new float[] {0, 0, 0, 0, 1}};
ColorMatrix colorMatrix = new ColorMatrix(matrixItems);
ImageAttributes imgAttr = new ImageAttributes();
imgAttr.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
//绘制阴影图像
g.DrawImage(
drawedImage,
new Rectangle(x, y, drawedImage.Width, drawedImage.Height),
0, 0, drawedImage.Width, drawedImage.Height,
GraphicsUnit.Pixel, imgAttr);
//保存文件
string[] allowImageType = { ".jpg", ".gif", ".png", ".bmp", ".tiff", ".wmf", ".ico" };
FileInfo file = new FileInfo(this.ModifyImagePath);
ImageFormat imageType = ImageFormat.Gif;
switch (file.Extension.ToLower())
{
case ".jpg":
imageType = ImageFormat.Jpeg;
break;
case ".gif":
imageType = ImageFormat.Gif;
break;
case ".png":
imageType = ImageFormat.Png;
break;
case ".bmp":
imageType = ImageFormat.Bmp;
break;
case ".tif":
imageType = ImageFormat.Tiff;
break;
case ".wmf":
imageType = ImageFormat.Wmf;
break;
case ".ico":
imageType = ImageFormat.Icon;
break;
default:
break;
}
MemoryStream ms = new MemoryStream();
modifyImage.Save(ms, imageType);
byte[] imgData = ms.ToArray();
modifyImage.Dispose();
drawedImage.Dispose();
g.Dispose();
FileStream fs = null;
if (this.OutPath == null || this.OutPath == "")
{
File.Delete(this.ModifyImagePath);
fs = new FileStream(this.ModifyImagePath, FileMode.Create, FileAccess.Write);
}
else
{
fs = new FileStream(this.OutPath, FileMode.Create, FileAccess.Write);
}
if (fs != null)
{
fs.Write(imgData, 0, imgData.Length);
fs.Close();
}
}
finally
{
try
{
drawedImage.Dispose();
modifyImage.Dispose();
g.Dispose();
}
catch { ;}
}
}
#endregion
}

前台代码如下所示
代码如下:


<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="demo.WebForm1" %> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head runat="server"> 
<title></title> 
</head> 
<body> 
<form id="form1" runat="server"> 
<div> 
<asp:FileUpload ID="FileUpload1" runat="server" /> 
<br /> 
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" /> 
</div> 
</form> 
</body> 
</html> 
 
cs类的代码如下所示 
 代码如下:
protected void Button1_Click(object sender, EventArgs e) 
{ 
string extension = Path.GetExtension(this.FileUpload1.FileName).ToUpper(); 
string fileName = Guid.NewGuid().ToString(); 
string savePath = Server.MapPath("../upfile/" + fileName+ extension); 
if (!Directory.Exists(Path.GetDirectoryName(savePath))) 
{ 
Directory.CreateDirectory(Path.GetDirectoryName(savePath)); 
} 
this.FileUpload1.SaveAs(savePath); 
//实例化类 
picmark wm = new picmark(); 
wm.DrawedImagePath = Server.MapPath("/upfile/" + "backlogo.gif") ; 
wm.ModifyImagePath = savePath; 
wm.RightSpace = 145; 
wm.BottoamSpace =17; 
wm.LucencyPercent = 50; 
wm.OutPath = Server.MapPath("/upfile/" + fileName.Replace("-","").ToUpper() + extension); 
wm.DrawImage(); 
//fileName = "_New_" + fileName; 
//string sPath = Server.MapPath("../upfile/" + fileName + extension); 
//this.FileUpload1.SaveAs(sPath); 
//保存加水印过后的图片,删除原始图片 
if (File.Exists(savePath)) 
{ 
File.Delete(savePath); 
//File.Delete(wm.OutPath); 
}

asp.net 添加水印的代码(已测试)

人气教程排行